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 A003708 Expansion of tan(log(1+x)). (Formerly M3547) 5
 0, 1, -1, 4, -18, 110, -810, 7040, -70280, 792200, -9945000, 137550400, -2077719600, 34026132400, -600433397200, 11356783360000, -229193571984000, 4915556301968000, -111644265232656000, 2676908220027392000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 REFERENCES N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..200 FORMULA a(n) ~ n! / (exp(Pi/2) * (exp(-Pi/2)-1)^(n+1)). - Vaclav Kotesovec, Feb 16 2015 MATHEMATICA With[{nn=20}, CoefficientList[Series[Tan[Log[1+x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, May 28 2013 *) CROSSREFS Sequence in context: A214840 A060223 A144085 * A000986 A143920 A233534 Adjacent sequences:  A003705 A003706 A003707 * A003709 A003710 A003711 KEYWORD sign AUTHOR STATUS approved

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Last modified December 13 17:32 EST 2018. Contains 318086 sequences. (Running on oeis4.)